TSL2671 datasheet(20/45 Pages) OSRAM

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Page 19

[v1-00] 2016-Jul-12

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TSL2671 − Principles of Operation

Power Management

Power consumption can be controlled through the use of the

wait state timing because the wait state consumes only 65

μA

of power. Figure 37 shows an example of using the power

management feature to achieve an average power

consumption of 138

μA current with four 100-mA pulses of

proximity detection.

Figure 22:

Power Consumption Calculations

Note(s):

1. Prox Accum = 16.3

μs per pulse × 4 pulses = 65 μs = 0.065 ms

2. LED On = 7.2

μs per pulse × 4 pulses = 29 μs = 0.029 ms

4 IR LED Pulses

ms (29 ms LED On Time)

2.72 ms

43.52 ms

5.44 ms

Prox ADC

Prox Accum

Wait

Delay

Average Current = ((0.029

y 100) + (2.72 y 0.175) + (43.52 y 0.065) + (5.44 y 0.175)) / 52 = 138 mA

State

Duration (ms)

Current (mA)

Prox Accum

0.065 (Note 1)

LED On

0.029 (Note 2)

100.0

Prox ADC

2.72

0.175

Wait

43.52

0.065

Wait Delay

5.44

0.175

Example: ~49 ms Cycle TIme

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